Which risk increases as a nuclear reactor enriches uranium isotopes?

💡 Explanation

Criticality risk increases because enrichment raises the concentration of fissile Uranium-235 via isotopic separation leading to easier sustained chain reactions; therefore a lower critical mass, rather than other issues related to materials or minor neutronics effects.

• Which consequence is observed when repulsive electrostatic interactions dominate electron orbitals?
• Which outcome results when exceeding the Zener breakdown voltage for short channel MOSFETs?
• Which risk increases when the gap capacitance within a spark-gap transmitter shrinks due to electrode oxidation?
• Which outcome occurs when a Stirling engine cycle operates at an extremely high frequency?
• Which outcome occurs when the humidity rises rapidly around the Peltier thermoelectric cooler's cold junction below dew point?
• Which mechanism causes stimulated emission in semiconductor laser diodes?